Year	Percent
1995	64.04
1996	65.91
1997	62.94
1998	52.47
1999	51.13
2000	60.31
2001	62.56
2002	64.58
2003	63.15
2004	65.75
2005	66.22
2006	66.86
2007	66.62
2008	65.47
2009	63.74
2010	65.13